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Biofilm thickness effect on the diffusion limitation in the bioprocess reaction: Biofloc critical diameter significance
Authors:M. Hamdi
Affiliation:(1) Département de Technologie (Bioprocédés), Ecole Supérieure des Industries Alimentaires, 58, Av. Alain Savary, 1003 Tunis, Tunisia
Abstract:A convenient physical model for biomass involves consideration of individual cells as ldquoactiverdquo centers dispersed through a continuous region in which transport takes place by molecular diffusion. This paper investigates for steady state conditions the variation of apparent kinetic constant (Kmprime) of bacteria in relation to biofloc diameter with solid and/or liquid-phase diffusion. When the biochemical reactions are limited only by liquid-phase diffusion, theKmprime increases whenD increases. With solid-phase diffusion limitation only, theKmprime increases linearly with the diameterD of the floc. When both solid and liquid-phase diffusion limitations are considered, the apparentKm is affected by liquid-phase diffusion limitation with very smallD and by solid-phase diffusion limitation with higherD. The critical diameterDc can be assumed to be theD at which solid-phase diffusion limitation becomes more significant than liquid-phase diffusion limitation.
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